Die-casting die for punching sheet

Abstract

The utility model belongs to the technical field of motor production equipment, and relates to a die-casting die for punching sheets, which comprises an upper die and a lower die, the punching sheets to be laminated are sequentially laminated in the lower die, the punching sheets are closed-slot punching sheets, an annular middle die capable of radially shrinking is arranged between the lower die and the punching sheets, and the annular middle die is provided with an annular groove. An inclined plane for driving the middle die to radially contract is arranged between the inner wall of the lower die and the outer wall of the middle die, the inner wall of the middle die abuts against the outer wall of a punching sheet during lamination and forms an outer clamping type positioning structure, a plurality of springs which correspond to the middle die and extend downwards are arranged at the bottom of the upper die in the circumferential direction, and when the upper die is pressed downwards for a first section of stroke, the middle die is pressed downwards for a second section of stroke. The spring drives the middle die to move downwards and contract inwards to hold the punching sheet, and in the second stroke, the bottom of the upper die presses the punching sheet. According to the die-casting die for the punching sheet, secondary machining is not needed after die-casting, positioning is more accurate, and product quality is better.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of motor production equipment relates to a die casting die of punching piece. BACKGROUND

[0002] The rotor core of motor is produced by die casting, and is formed by stacking rotor punching pieces. The traditional punching piece adopts an open slot structure, and a protective cover is arranged on the punching piece cover during die casting to prevent the outflow of aluminum liquid. The positioning mode of the punching piece is false shaft positioning. When stacking the punching pieces, the well-arranged punching pieces are sequentially sleeved on the false shaft to ensure the stacking of the punching pieces. This die casting mode produces burrs at the edge, and secondary processing is required. In addition, the positioning mode is prone to displacement, which affects the product quality after die casting. SUMMARY

[0003] The utility model provides a die casting die of punching piece in view of the deficiency of prior art, and does not need secondary processing after die casting, and the positioning is more accurate, and the product quality is better.

[0004] To solve the above technical problems, the utility model discloses the following technical scheme:

[0005] A die casting die of punching piece, comprising an upper die and a lower die, the lower die is sequentially stacked with the punching piece to be stacked, the punching piece is a closed slot punching piece, an annular middle die capable of being radially contracted is arranged between the lower die and the punching piece, a slope capable of driving the middle die to be radially contracted is arranged between the inner wall of the lower die and the outer wall of the middle die, the inner wall of the middle die and the outer wall of the punching piece are in contact and form an outer clamping type positioning structure during stacking, a plurality of springs corresponding to the middle die and extending downward are arranged on the bottom of the upper die in the circumferential direction, when the first stroke of the upper die is pressed, the spring drives the middle die to move downward and contract inward to tightly hold the punching piece, and the second stroke of the upper die is pressed to tightly hold the punching piece.

[0006] In the die casting die of punching piece, the middle die comprises a plurality of fan-shaped rings arranged at intervals, the outer wall of the middle die is a slope inclined inward from top to bottom, the inner wall of the lower die is a slope inclined inward from top to bottom, when the middle die moves from top to bottom, the gap between the fan-shaped rings is reduced, and the middle die is contracted inward.

[0007] In the die casting die of punching piece, the middle die is made of a deformable material, one side of the middle die is provided with an opening penetrating from top to bottom, and the other side is provided with an outer open slot penetrating from top to bottom, the outer wall of the middle die is a slope inclined inward from top to bottom, the inner wall of the lower die is a slope inclined inward from top to bottom, when the middle die moves from top to bottom, the gap of the opening is reduced, the outer open slot provides a deformation space, and the middle die is contracted inward.

[0008] In the punch's die casting die, the bottom of the upper die is coaxially provided with upper pressing rings corresponding to the punch, and the upper pressing rings form aluminum casting upper end face forming cavities therebetween; the upper die is provided with upper through holes corresponding to the closed slots, specifically, the upper pressing rings are provided corresponding to the non-closed slot portions of the punch, and the aluminum casting upper end face forming cavities are provided corresponding to the closed slot portions of the punch; the bottom of the lower die is coaxially provided with lower pressing rings corresponding to the punch, and the lower pressing rings form aluminum casting lower end face forming cavities therebetween; the lower die is provided with lower through holes corresponding to the closed slots, specifically, the lower pressing rings are provided corresponding to the non-closed slot portions of the punch, and the aluminum casting lower end face forming cavities are provided corresponding to the closed slot portions of the punch.

[0009] In the punch's die casting die, the bottom of the lower die is provided with an annular limiting groove, the limiting groove is matched with the bottom of the middle die, and when the middle die abuts against the bottom of the limiting groove, the middle die simultaneously forms a clamping structure of the punch.

[0010] In the punch's die casting die, the middle portion of the punch is provided with a shaft hole, the middle portion of the upper die is provided with a positioning hole matched with the shaft hole, and the positioning hole and the shaft hole are inserted with a dummy shaft to form a circumferential positioning structure.

[0011] Compared with the prior art, the punch's die casting die has the following beneficial effects:

[0012] The punch's die casting die provided by the utility model sets the punch as a closed slot, so that the aluminum liquid will not overflow during die casting, and therefore, a protective cover is no longer needed, and space is provided for the setting of the middle die. The utility model further positions the middle die instead of a dummy shaft to form an outer clamping type positioning structure, and compared with the traditional dummy shaft positioning, better positioning effect can be obtained, and the possibility of displacement during die casting is eliminated, and the quality of finished products is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a perspective view of the utility model;

[0014] Fig. 2 is an axial sectional view of the utility model;

[0015] Fig. 3 is a cooperation view of the lower die and the middle die of the utility model;

[0016] Fig. 1 is an upper die; 2 is a lower die; 3 is a punch; 4 is a middle die; 5 is an inclined surface; 6 is a spring; 7 is an opening; 8 is an outer opening slot; 9 is an upper pressing ring; 10 is an aluminum casting upper end face forming cavity; 11 is an upper through hole; 12 is a lower pressing ring; 13 is an aluminum casting lower end face forming cavity; 14 is a lower through hole; 15 is a limiting groove; 16 is a shaft hole; and 17 is a positioning hole. DETAILED DESCRIPTION

[0017] The utility model will be further described below with specific embodiments in combination with the drawings, referring to Figs. 1-3 :

[0018] A die-casting die of a punched sheet, comprising an upper die 1 and a lower die 2, the punched sheets 3 to be laminated are sequentially stacked in the lower die 2, the punched sheets 3 are closed slot punched sheets (i.e. the slot type of the punched sheets 3 is a circumferentially distributed closed slot, a single punched sheet 3 is not shown in the drawings, but all closed slot punched sheets can be produced using the die of the embodiment), an annular middle die 4 that can contract radially is arranged between the lower die 2 and the punched sheets 3, a slope 5 that drives the middle die 4 to contract radially is arranged between the inner wall of the lower die 2 and the outer wall of the middle die 4, the inner wall of the middle die 4 and the outer wall of the punched sheets 3 abut and form an outer clamping positioning structure when laminating, a plurality of springs 6 that correspond to the middle die 4 and extend downward are arranged circumferentially at the bottom of the upper die 1, when the first stroke of the downward movement of the upper die 1, the springs 6 drive the middle die 4 to move downward and contract inward to tightly hold the punched sheets 3, and when the second stroke, the bottom of the upper die 1 presses the punched sheets 3.

[0019] The working process of the embodiment is as follows: the punched sheets 3 to be laminated and the middle die 4 are placed in the fixed lower die 2, the upper die 1 is closed, the power device drives the upper die 1 to move downward, in the process of downward movement, the springs 6 first contact the upper end surface of the middle die 4, when the upper die 1 continues to move downward, the elastic force generated by the deformation of the springs 6 drives the middle die 4 to move downward, the middle die 4 is guided to contract inward by the slope 5 in the process of downward movement, until it tightly holds the punched sheets 3 to form an outer clamping positioning structure, when the upper die 1 continues to move downward, the bottom of the upper die 1 begins to contact the uppermost punched sheet 3, then downward force is applied to the punched sheet 3, the lower die 2 is pressed to form a die closing state, the aluminum liquid is injected from the bottom of the lower die 2, and the mold is opened after cooling and forming.

[0020] The radially contractible middle die 4 of the embodiment can adopt various structures:

[0021] Firstly, the middle die 4 comprises a plurality of spaced fan-shaped rings, the outer wall of the middle die 4 is a slope 5 that inclines inward from top to bottom, the inner wall of the lower die 2 is a slope 5 that inclines inward from top to bottom, the gap between the fan-shaped rings decreases when the middle die 4 moves from top to bottom, and the middle die 4 contracts inward, this split type middle die 4 can adopt a rigid material, thus having better positioning effect.

[0022] Secondly, the middle die 4 is made of deformable material, one side of the middle die 4 is provided with an opening 7 penetrating from top to bottom, the other side is provided with an outer opening 7 slot penetrating from top to bottom, the outer wall of the middle die 4 is a slope 5 inclined inward from top to bottom, the inner wall of the lower die 2 is a slope 5 inclined inward from top to bottom, when the middle die 4 moves from top to bottom, the gap of the opening 7 is reduced, the outer opening 7 slot provides a deformation space, the middle die 4 is contracted inward, since the middle die 4 only needs a small radial contraction size, the material of the middle die 4 only needs to produce a small deformation, and the integrated middle die 4 can be more convenient to use (the middle die 4 of the structure is shown in the drawing).

[0023] Further, the bottom of the upper die 1 is coaxially provided with upper pressing rings 9 corresponding to the punch 3, the upper pressing rings 9 form aluminum casting upper end face forming cavities 10 between them, the upper die 1 is provided with upper through holes 11 corresponding to the closed slots, specifically, the upper pressing rings 9 are correspondingly arranged with the part of the punch 3 which is not closed, and the aluminum casting upper end face forming cavities 10 are correspondingly arranged with the part of the punch 3 which is closed.

[0024] Further, the inner cavity of the lower die 2 is provided with an annular limiting groove 15 at the bottom, the limiting groove 15 is matched with the bottom of the middle die 4, when the middle die 4 is in contact with the bottom of the limiting groove 15, the middle die 4 forms a clamping structure of the punch 3 at the same time, and through the arrangement of the limiting groove 15, the positioning effect of the middle die 4 is better.

[0025] The embodiment can also be used in cooperation with a dummy shaft: the middle part of the punch 3 is provided with a shaft hole 16, the middle part of the upper die 1 is provided with a positioning hole 17 matched with the shaft hole 16, the positioning hole 17 and the shaft hole 16 are inserted with a dummy shaft to form a circumferential positioning structure. The dummy shaft of the embodiment is different from the existing dummy shaft, only needs to provide a certain circumferential positioning effect, and makes the closed slots of the punch 3 more neatly stacked.

[0026] The above embodiment is only a preferred embodiment of the present application, and does not limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. A die-casting die for punching sheets, comprising an upper die (1) and a lower die (2), wherein punching sheets (3) to be laminated are sequentially stacked in the lower die (2), characterized in that: The punch (3) is a closed slot punch; a radially contractible annular middle die (4) is provided between the lower die (2) and the punch (3); an inclined surface (5) for driving the middle die (4) to contract radially is provided between the inner wall of the lower die (2) and the outer wall of the middle die (4); when superimposed, the inner wall of the middle die (4) contacts the outer wall of the punch (3) and forms an external clamping positioning structure; a plurality of springs (6) corresponding to the middle die (4) and extending downward are provided at the bottom of the upper die (1) along the circumferential direction; during the first stroke of the upper die (1) pressing downward, the springs (6) drive the middle die (4) to move downward and contract inward to hold the punch (3); during the second stroke, the bottom of the upper die (1) presses the punch (3).

2. A die-casting mold for a punching sheet according to claim 1, characterized in that: The middle mold (4) comprises a plurality of spaced sector rings, the outer wall of the middle mold (4) is an inclined surface (5) inclined inwardly from top to bottom, and the inner wall of the lower mold (2) is an inclined surface (5) inclined inwardly from top to bottom.

3. The die-casting mold for a punching sheet according to claim 1, characterized in that: The middle mold (4) is made of a deformable material. One side of the middle mold (4) is provided with an opening (7) extending from top to bottom, and the other side is provided with an outer opening groove (8) extending from top to bottom. The outer wall of the middle mold (4) is an inclined surface (5) inclined inward from top to bottom, and the inner wall of the lower mold (2) is an inclined surface (5) inclined inward from top to bottom.

4. The die-casting mold for a punching sheet according to claim 1, characterized in that: The bottom of the upper die (1) is coaxially provided with an upper pressure ring (9) corresponding to the punching sheet (3), a cast aluminum upper end surface forming cavity (10) is formed between the upper pressure rings (9), and the upper die (1) is provided with an upper through hole (11) corresponding to the closed groove; the bottom of the lower die (2) is coaxially provided with a lower pressure ring (12) corresponding to the punching sheet (3), a cast aluminum lower end surface forming cavity (13) is formed between the lower pressure rings (12), and the lower die (2) is provided with a lower through hole (14) corresponding to the closed groove.

5. The die-casting mold for a punching sheet according to claim 1, characterized in that: An annular limiting groove (15) is provided at the bottom of the inner cavity of the lower die (2), and the limiting groove (15) is adapted to the bottom of the middle die (4). When the middle die (4) contacts the bottom of the limiting groove (15), the middle die (4) simultaneously forms a clamping structure for the punching sheet (3).

6. The die-casting mold for a punching sheet according to claim 1, characterized in that: The punching sheet (3) is provided with an axial hole (16) in the middle, and the upper die (1) is provided with a positioning hole (17) matching the axial hole (16) in the middle. A dummy shaft is inserted into the positioning hole (17) and the axial hole (16) to form a circumferential positioning structure.

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